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radiation
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about radiation on dxzone.com
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Antennas
- Building an own Stackmatch
- Nowdays lots of people are putting up antennas to either beam in different directions at the same time or just to stack them and get a lower angle of radiation. Use this stackmatch to match you array.
[Hits: 671 | Votes: 1 | Rate: 8.00] Antennas : 10M
- Cubic Quad
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- The cubic quad is a very popular way to get reasonably high gain and excellent front to back ratios as well as low angles of radiation for without going to extreme heights. Includes design for 2 6 10 12 15 meter bands
[Hits: 55613 | Votes: 31 | Rate: 4.56] Antennas : 15M
- The extended double zepp
- This wire antenna exhibits extraordinarily high gain in a bi directional radiation pattern.
[Hits: 11085 | Votes: 27 | Rate: 8.04] - 21 mhz half wave GP Antenna
- 21 mhz half wave ant -very low radiation angle - full size and light weight- all coax matching system - decoupling care to prevent low angle radiation degrade
[Hits: 1304 | Votes: 1 | Rate: 4.00] Antennas : 20M
- 20m delta loop
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- This antenna is fed for vertical polarisation, to give a low angle of radiation for DX and also a nearly omni-directional radiation pattern
[Hits: 49576 | Votes: 36 | Rate: 6.08] Antennas : 80M
- 80M Vertical antenna with capacitance hat
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- Simple wire antenna cheap to make, using readily available materials, Low angle radiation, with rejection of high angle signals Wide bandwidth, with resonance at the 80M DX window (3.790-3.800 MHz); and Maximum height is 40 feet
[Hits: 19622 | Votes: 22 | Rate: 7.32] Antennas : EH
- W8JI Technical pages
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- Amplifier, vacuum tube, receiving beverage loop vertical and transmitting antenna system technical information radiation resistance, EH antenna, noise,receivers, and information on keyclicks.
[Hits: 19014 | Votes: 35 | Rate: 8.23] - EH antenna power lost considerations
- Out of Balance Current or Longitudinal Mode Current in the Coaxial Cable causes radiation from the coax. But how large a proportion of the total power is radiated or lost from this Current?
[Hits: 1062 | Votes: 1 | Rate: 4.00] Antennas : Feed Lines
- Detuning Towers
- The goal of detuning is not to avoid resonance, but rather to minimize re-radiation and/or current in the interfering structure.
[Hits: 532 | Votes: 1 | Rate: 10.00] Antennas : G5RV Antennas : Theory
- Radiation and scattering
- Basic antenna theory, Antenna directivity and effective area, Antenna arrays
[Hits: 2794 | Votes: 2 | Rate: 10.00] - Small antennas and radiation resistance
- Small antenna, what causes loss and how to increase radiation resistance in small antennas., A description of loss and radiation resistance.
[Hits: 702 | Votes: 0 | Rate: 0.00] - Antenna Height Theory
- Antenna mounting height, the higher the better? Learn how radiation pattern change, and decide if you need an higher or a lower angle for your dx needs.
[Hits: 1198 | Votes: 4 | Rate: 7.00] - Radiation and fields
- Electric Fields, magnetic fields, electromagnetic fields, losses, fresnel zone, nearfield and farfield
[Hits: 310 | Votes: 1 | Rate: 10.00] Antennas : VHF UHF
- DK7ZB 144 mhz Yagis
- High gain, good pattern and acceptable bandwidth. These aims can be realized with a radiation-resistance of 25-35Ohms, because the 28-Ohm-feedpoint is very simple to match.
[Hits: 1438 | Votes: 6 | Rate: 7.67] Operating Modes : Amateur Radio Astronomy
- 408 MHz Survey
- Survey of galactic synchrotron radiation at 408 MHz in the south of England using a 10 metre dish and a Dicke radiometer
[Hits: 2077 | Votes: 1 | Rate: 10.00] Operating Modes : VHF UHF Propagation
- NOAA Space Weather Scales
- The NOAA Space Weather Scales were introduced as a way to communicate to the general public the current and future space weather conditions and their possible effects on people and systems.
The scales describe the environmental disturbances for three event types: geomagnetic storms, solar radiation storms, and radio blackouts.
[Hits: 757 | Votes: 2 | Rate: 10.00] Radio Scanning : Nature : Weather
- NovaLynx Corporation
- "Instruments & Systems for Weather & Water Monitoring; weather stations, wind alarms, sensors for wind speed, wind direction, precipitation, temperature, relative humidity, barometric pressure, solar radiation, evaporation, rain & snow gauges, lightning detection."
[Hits: 454 | Votes: 3 | Rate: 10.00] Software : Antenna analysis
- Antenna Visualization
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- UNIX Application developped at the University of Texas Department of the Computer Sciences, permit to display the radiation pattern and the current magnitude.
[Hits: 5314 | Votes: 17 | Rate: 6.12] - Yagi Designer
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- Program that produces antenna radiation patterns and graphs for SWR, forward gain, and F/B ratios
[Hits: 18682 | Votes: 42 | Rate: 6.63] - 4NEC2 antenna modeler
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- 4nec2 is a completely free Nec2, Nec4 and windows based tool for creating, viewing, optimizing and checking 2D and 3D style antenna geometry structures and generate, display and/or compare near/far-field radiation patterns for both the starting and experienced antenna modeler.
Can be interfaced to HFwin32 propagation prediction software.
[Hits: 23253 | Votes: 107 | Rate: 7.55] Software : Circuit Design
- HeliCoil
- Inductance calculation for single layer, air-wounded coils and helixes up to about 800 MHz. Inductance calculations accuracy is around 1%. Also, coils with maximum Q for given inductance, resonant RF chokes, PI and T resistive attenuators calculations are provided. Skin effects, radiation losses and other minor side effects are not accounted in maksimum Q factor coils calculations. Program assumes using copper (Cu) enameled or silver (Ag) plated wire. Program is writen bilingual in English and Serbian by YU1AW
[Hits: 1557 | Votes: 8 | Rate: 4.88] Technical Reference : Electronics Technical Reference : Radio Frequency Interference
- Safety: RF awarness guidelines
- Although Amateur Radio is basically a safe activity, in recent years there has been considerable discussion and concern about
the possible hazards of electromagnetic radiation (EMR), including both RF energy and power frequency (50-60 Hz) electromagnetic fields. This section summarizes what is now known and offers safety precautions based on the research to date.
[Hits: 384 | Votes: 0 | Rate: 0.00]
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